I have two aircraft (DC-8-62 and A340-600), which both have the same speed (890km/h). I tried on Quimby (using the new UI) to transfer the schedule from one to the other, but it errors. I have the speed of the DC-8 (the plane the flight is currently on) at max speed (935km/h).
So I attempt to edit the flight parameters on the current flight WITHOUT changing aircraft. When I click edit, it says that the aircraft performance is invalid, despite the flight being green and the plane completing the flights every day.
One possibility is that if you use speed override on the first aircraft, and the transferred-to (second) aircraft would be in the second slope of performance chart on that particular route, such (second) aircraft could not do that route with non-default speed (be it slower or higher even by 1 km/h) because of the hotfix recently implemented.
Give me the route and I will test it if this is the case.
Ah... I forgot, I am not talking to you... but anyway, I can be so nice and still test it to see if this is the case.
Doesn't explain why the flight doesn't work any more on the plane currently operating the flight.
Turnaround times?
Again, doesn't explain why the same exact craft currently operating the flight suddenly says there's an error when I edit.
One possibility is that if you use speed override on the first aircraft, and the transferred-to (second) aircraft would be in the second slope of performance chart on that particular route, such (second) aircraft could not do that route with non-default speed (be it slower or higher even by 1 km/h) because of the hotfix recently implemented.
Give me the route and I will test it if this is the case.
Ah... I forgot, I am not talking to you... but anyway, I can be so nice and still test it to see if this is the case.
LAX - LHR using a DC-8-62 at 935 km/h (although I tried adjusting the speed lower and it didn't help at least for the first few adjustments).
The problem is fuel capacity: If you fly at increased speed, the aircraft burns more fuel. If you use the performance check tool, you will see that the DC-8-62 can't fly faster than 900 km/h on LAX-LHR. This fuel increase was only implemented in an update about two weeks ago, so if you scheduled your flight before then, it still works, however you can't schedule new flights at 935 km/h (or edit the existing one), because then the system checks the fuel burn.
As opposed to Payload Performance Calculator, The Speed Fuel burn calculator only increases fuel consumption when speed increases. The more you increase speed (and the longer the trip) the more fuel will be consumed. But it will accept fuel consumption increase only to the maximum of the fuel tank capacity.
This is in contrast to the Payload Performance Calculator, which will actually DECREASE the PAYLOAD over longer distance, so some aircraft can fly father (second and third slope) but with decreased payload (fewer passengers on board). This is on constant, default cruise speed.
With Fuel-Speed calculation, initially on the first downward performance slope, the fuel tanks will be getting fuller and more fuel being burnt, but speed increase will still be somewhat possible. But somewhere half down the second slope, the fuel tanks get completely full to permit that mission, so no more fuel to take in, so no more speed increase possible.
Unfortunately the Fuel Speed calculator is a bit dummy, as it only takes into consideration the fuel required, but not the payload (decrease possibility). What an intelligent calculator would do is to decrease payload after the fuel tanks are full with fuel required for the mission, so the aircraft could still fly at faster speed and farther, but with less payload. But that will be the job of the NEW PERFORMANCE SYSTEM still being developed. So until then, we will have to live with this somewhat restrictive Fuel-Speed calculation system.
To sum up, the safe bet is - you can increase speed with no problems for as long as the aircraft is on the first flat line of its performance graph (100% payload). The farther you go and the faster you go, the quicker you will get into the first performance downward pointing slope, which will make speed increase (or decrease) more restrictive until a point where it will become impossible.
I hope this helps explain the actual fuel/speed performance system.
